[patch] ask for username if getting UID fails

Hi,

some users reported problems with authentication
on win98 systems. The reported error was "error getting UID".
See http://subversion.tigris.org/servlets/ReadMsg?list=dev&msgId=246759
for example.

The attached patch fixes this. If the UID can't be obtained then
subversion would no more exit with an error but ask for
the username instead.
Since I don't have Win98 I can't really test if that would
fix the reported problem but I think it's a good idea
anyway to ask for a username instead of erroring out.

Stefan

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